#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int del(int n, int k)
{
	int result = 0; 
	for (int i = 2; i <= n; i++) 
	{
		result = (result + k) % i;
	}
	return result + 1;
}

int main()
{
	int n, k;
	scanf("%d%d", &n, &k);
	int j=del(n, k);
	printf("%d", j);
	return 0;
}